问题：

[单选]

A new router was configured with the following commands：

The configuration above was found on an Internet Service Provider’s （ISP） Multiprotocol LabelSwitching （MPLS） network. What is its purpose？（）

A . To prevent customers from running TDP with the ISP routers
B . To prevent customers from running LDP with the ISP routers
C . To prevent other ISPs from running LDP with the ISP routers
D . To prevent man-in-the-middle attacks
E . To use CBAC to shut down Distributed Denial of Service attacks
F . To use IPS to protect against session-replay attacks
G . None of the above